Telephone plug



Aug.A 14, 1928. 1,680,430

L. Gf PAcENT TELEPHONE PLUG Filed Feb. 17, 1925 l f f l f /4 l// ff INVENTOR ATTORNEY Patented ug. 14, 1928.

UNITED i STATES PATENT OFFICE.

LOUIS G. PACENT, OF WINFIELD PARK, `NEVI YORK, ASSIGNOR TO PACENTvELECTRIC COMPANY, INCORPORATED, F NEXUKYORK, N. Y., A CORPORATION OIE'v NEW YORK.

TELEPHONE PLUG.

Application filed February y cord terminals on radio telephone headsets,

vary considerably in diameter and this condition increases the difficulty of producing a lowpriced plug to which any two headsets may be connected in parallel as will be presently shown.

The object ofthe present invention is to provide a plug, which can be produced at low cost, to which the cord 4tips of two telephone headsets may be connected in parallel, even though there is avery substantial dili'erence in the diameters of the cord tips.

The principal novel feature of this invention, whereby the stated object is accomplished,` resides in the provision of self-ad justng clamps adapted to grip the cord tips and to automatically adjust themselves, to compensate for any differences in the diameters of the several cord tips, so that each of them may be equally gripped.

Additional novel features consist in certain details of construction which materially contribute to reducing the cost of production.

The preferred embodiment of this invention is described in detail hereinafter, and illustrated in the accompanying drawings, wherein Fig. l is a longitudinal section of a telephone plug,

Fig. 2 is a longitudinal view of the same plug taken at right angles to the view shown in Fig. l and with the handle portion shown in section,

Fig. 3 is a cross-sectional view taken along the line 3 3 of Fig. l,

Fig. 4 is an enlarged cross-sectional view of the cord tip clamping device, and

Figs. 5 and 6 are perspective views showing details of construction.

The plug structure comprises a tip l and sleeve 2, insulated from each other by means of a bushing 3 and washer 4 of insulating material. The sleeve 2 is in abuttin tact with a metal bushing 5 which is also insulated from the tip structure by bushing 3.

COD- y 17, 1925. Serial No. 9,726.

A pair of specially shaped metal stampings (S and 7, one of which is shown in perspective in Fig. (i and connected vrespectively to the tip and sleeve conductors, constitutin a part oit `the assembled unit comprising t e elements l to 5, inclusive. Eachmetal stamping 6, 7 is formed with a air Vof arallel grooves 7, 7b, the radius o `which is large enough to accommodate pin-type cord tips oi the largest diameter commercially used.

Each stamping 7 has a rectangular aperture IC through which the rectangular end portion 8L of a threaded stud 8 extends. The rectangular end portion 8 of each stud 8 is headed over after being assembled in its stamping 7 as is clearly shown in Figs. 1, 3 land 4. There is a considerable clearance provided between the sides of the apertures 17 and the rectangular portion 8a as is most clearly shown in Fig. 4. This clearance provides for a considerable lateral freedom of movement for the stud S-this being indicated in Fig. 4 by three center lines, denoting diii'erent positions which the stud 8 may take with respect to the metal stamping. rlhe studs 8 are, in effect, pivotally attached to the respective metal stampings. Studs 8 are each provided with a slotted nut 9.

Fig. 3 shows in cross-section two pairs of pin-type cord tips of different diameters connected to the plug. The cord-tips designated by reference numeral l0 constitute one pair, while those designated by reference numeral 1l constitute the other pair. Clearly, if the studs 8 were rigidly secured to the metal stampings 6 and 7 and the nuts 9 were closely itted to the studs 8, it would be very difficult to grip cord-tipsof considerably different diameter, but the `pivotal movement of studs 8 compensates for these dili'erences as illustrated in Fig. 3. The cord-tips gripped between one stamping `6 and its associated nut 9 are both electrically connected to the tip conductor, while the other two cord-tips are both electrically connected to the sleeve conductor.

A molded insulating member 12 having an elongated aperture 12'* to which the tie cord 'forming a part of the telephone conductor cord is connected is held between the two By reason of the spring finger 17 the member 12 cannot be Withdrawn by any tension which may be applied to the tie cord.

The plug is provided with a twopart handle comprising members'13 and 14, both of which are preferably ofv insulating material and are screwed vtogether at 15. The member 13 is preferably a tight lit on the sleeve conductor 2and bushing 5.

` In order to attach or detach the conductor cord to and from the plug, the handle memoer 14T is detached from its complementary member 13 thus permitting access to the otherwise enclosed parts.

The novel features of this invention which have been pointed ont may be considerably modified -withinV the scope and tenor of the invention and the appendedl claim should be construed accordingly.l

' I claim: Y

A` telephone plug comprising tip and sleeve conducting members adapted to be inserted in a jack, an electrical connector associated with each of said conducting members, each of said connectors comp-rising a substantially flat member having two grooves therein adapted toy receive electrical conductors, a threadedr member pivotally mounted between said grooves having. a nut thereon of substantial size adapted to engage the conductors lying in said grooves, whereby, due to the pivotal mounting, conductors of substantially different size may be securely retained, said connectors being positioned so that the flat faces are substantially parallel, an insulating member between said connectors having a recess therein adapted Vto hold said insulating member in position by coperating with an upset lug on one of said connectors, said insulating member having means thereon to which a tie 'member may be secured for taking the strain from the electrical conductors held by saldy connectors. v

In testimony whereof I aflix my signature.

LOUIS G. PACENT. 

